Tooth 26 (FDI): maxillary left first molar

The three numbers

Careful with plain numbers: Universal 26 is a different tooth, the mandibular right lateral incisor (FDI 42).

About this tooth

Name

Maxillary left first molar

Set

Adult (permanent)

Position

Upper arch, patient left (upper left, quadrant 2)

Erupts

6 to 7 years

Roots

3

Root canals

3 or more

Crown surfaces

Mesial, distal, buccal, palatal (lingual) and occlusal.

Also written

#14 (Universal), 2.6 (FDI with a dot), upper left 6

Read on 23 October 2026. Sources: American Dental Association, Tooth development charts (primary and permanent); Number of roots and canals, from Ingle's Endodontics; Dental anatomy, citing Ash and Nelson, Wheeler's Dental Anatomy, Physiology and Occlusion. Ages and counts are usual figures, and teeth vary from person to person.

On the chart

Teeth next to it

• Toward the middle: 25 (maxillary left second premolar)
• Toward the back: 27 (maxillary left second molar)
• Across the midline: 16 (maxillary right first molar)
• In the other arch: 36 (mandibular left first molar)

Convert any other tooth with the full chart.